A weak tropical wave moved off the coast of Africa on August 29.
Briefly attempting development
on September 2, it moved across northern South America into the
tropical eastern Pacific on the 9th.
The wave interacted with a broad low pressure area south to southwest
of the Gulf of Tehuantepec,
which then progressed northwest. On the 15th, it had organized
into a tropical depression about 250
miles south-southeast of Cabo San Lucas. The system turned
northward in response to an upper cyclone
to its north, which ultimately led to its dissipation as a tropical
cyclone on the morning of the 17th. The
remnant disturbance moved through the central Gulf of California, and
died off as it moved into northern
Baja California. Below is its track, supplied by the National
Hurricane Center.

The
graphics below show the storm total rainfall for Miriam, which used
information from the Comision Nacional
del Agua, parent agency of Mexico's National Weather Service. An
upper cyclone
to its north spread the heavy
rainfall just inland into west-central Mexico, which led to the highest
amount
recorded. The maximum in Baja
California closer to its center was slightly less.